Tree Encyclopedia | Tree IndexTrees live longer than any other organism on earth. Trees commonly live more than 1,000 years, and many grow considerably older. Trees have been living on Earth for more than 370 million years, and today can be found almost everywhere from the Arctic Circle to the Sahara Desert. Explore over 2,000 large format pictures of trees in more than 400 species. Family Pinaceae: Pine, Cedar, Spruce, and Fir